Phosphorus adsorbent based on water supply plant iron-aluminum mud and preparation method of phosphorus adsorbent

A technology of phosphorus adsorbent and iron-aluminum mud, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficult and fast removal of phosphorus and slow phosphorus adsorption, Achieve the effect of low cost, simple method and convenient operation

Inactive Publication Date: 2018-09-07
NANJING INST OF GEOGRAPHY & LIMNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorption of phosphorus by iron-aluminum sludge in water supply plants is slow, which makes it difficult for iron-aluminum sludge to quickly remove excess phosphorus in the water environment

Method used

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  • Phosphorus adsorbent based on water supply plant iron-aluminum mud and preparation method of phosphorus adsorbent
  • Phosphorus adsorbent based on water supply plant iron-aluminum mud and preparation method of phosphorus adsorbent
  • Phosphorus adsorbent based on water supply plant iron-aluminum mud and preparation method of phosphorus adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) After collecting fresh iron-aluminum mud from the dehydrated water supply plant, it is dried and ground into particles with a particle size of less than 0.178 mm.

[0036] (2) Put lanthanum chloride into the water so that the mass fraction of lanthanum is 0%, 1%, 2.5%, 5%, 10% and 20% respectively, and adjust the pH with NaOH solution, adjust once every hour for the first 4 hours Adjust the pH to 8~9, then let it stand for 12 hours and adjust it once more to obtain a weakly alkaline lanthanum suspension with a pH of 9, which is a mixture containing lanthanum hydroxide and lanthanum ions ;

[0037] (3) Mix the dry iron-aluminum sludge obtained in step (1) with the weakly alkaline lanthanum suspension at a mass ratio of 1:1, so that the mass of lanthanum is 0% of the iron-aluminum sludge of the water supply plant. , 1%, 2.5%, 5%, 10% and 20%;

[0038] (4) Mix the solution thoroughly with a stirrer, and incubate the mixed solution at 60 ℃ for 5 h, and then at room temperatu...

Embodiment 2

[0041] (1) After collecting fresh iron-aluminum mud from the dehydrated water supply plant, it is dried and ground into particles with a particle size of less than 0.178 mm.

[0042] (2) Put lanthanum chloride into water so that the mass fraction of lanthanum is 5%, and adjust the pH with KOH solution. Adjust the pH to 8-9 every hour for the first 4 hours, then let it stand for 12 hours, and then adjust Once, a weakly basic lanthanum suspension with a pH of 8 is obtained, and the weakly basic lanthanum suspension is a mixture containing lanthanum hydroxide and lanthanum ions;

[0043] (3) Mix the dried iron-aluminum mud of the water supply plant obtained in step (1) with the weakly alkaline lanthanum suspension at a mass ratio of 1:1 so that the mass of lanthanum is 5% of the iron-aluminum mud of the water supply plant;

[0044] (4) Mix the solution thoroughly with a stirrer, and incubate the mixed solution at 80°C for 8 hours, and then at 20°C to 30°C for 36 hours;

[0045] (5) Dry t...

Embodiment 3

[0046] Example 3 Comparative Example

[0047] (1) After collecting the iron-aluminum mud from the fresh dehydrated water supply plant, it is dried and ground into particles with a particle size of less than 0.178 mm;

[0048] (2) Put lanthanum chloride into the water so that the mass fraction of lanthanum is 10%, 5% and 0.5%, and adjust the pH with NaOH solution. Adjust the pH to 8-9 every hour for the first 4 hours, and then let it stand still 12 h, adjust once more to obtain a weakly alkaline lanthanum suspension with a pH of 8, which is a mixture containing lanthanum hydroxide and lanthanum ions;

[0049] (3) Mix the dried iron-aluminum mud from the water supply plant obtained in step (1) with the weakly alkaline lanthanum suspension in a mass ratio of 2:1, 1:1, and 1:10, so that the mass of lanthanum is relative to The iron and aluminum mud of the water supply plant are the same, that is, both are 5%;

[0050] (4) Mix the solution thoroughly with a stirrer, and incubate the mixed...

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Abstract

The invention discloses a phosphorus adsorbent based on water supply plant iron-aluminum mud and a preparation method of the phosphorus adsorbent, and belongs to the field of remediation of water environment. The preparation method comprises the following steps: (1) putting lanthanum salt into water, and regulating pH (Potential of Hydrogen), thus obtaining an alkalescent lanthanum suspension solution; (2) fully mixing dry water supply plant iron-aluminum mud with the alkalescent lanthanum suspension solution, thus obtaining a mixed solution; (3) firstly culturing the mixed solution at 60 to 80 DEG C for 5 to 8 hours, and then culturing at 20 to 30 DEG C for 24 to 36 hours; (4) directly drying a solution cultured in step (3), thus obtaining a solid material, i.e., the phosphorus adsorbent.The phosphorus adsorbent disclosed by the invention simultaneously has the adsorption characteristics of fast adsorption and slow balanced adsorption; the preparation method is a method developed under a situation that whether exogenous input can disturb a remediation effect or not cannot be ensured during an environment remediation process, and the preparation method is beneficial for realizingfast remediation and long-acting maintenance of the water environment; water eutrophic remediation can be facilitated, and implementation of controlling waste by waste is promoted.

Description

Technical field [0001] The invention belongs to the field of water environment restoration, and specifically relates to a high-efficiency and stable phosphorus adsorbent based on iron-aluminum mud in water supply plants and a preparation method thereof. Background technique [0002] Iron-aluminum sludge in water supply plants is an inevitable by-product in the production of drinking water, and its main ingredients are impurities in the water source and chemicals in the water treatment process. In the traditional flocculation filtration process, the iron-aluminum flocculant will be used to remove impurities in the water, which also promotes the iron-aluminum mud in the water supply plant to be rich in iron and aluminum, up to 20% of the total mud. Due to its rich iron and aluminum characteristics, the iron and aluminum sludge of water supply plants has a high adsorption capacity and is often selected for the development of high-efficiency phosphorus adsorbents. For example, the a...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/30C02F1/28C02F101/10
CPCB01J20/0207C02F1/281C02F2101/105
Inventor 王昌辉江和龙晏再生
Owner NANJING INST OF GEOGRAPHY & LIMNOLOGY
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